Some seeds are hard outside so they pass through the birds' guts and are dropped on the ground...
One of the characteristics of the seeds or fruits is that it usually has a hard shell and is hollow inside.
Pine cones house seeds inside. They are protected by the hard exoskeleton surrounding them.
Some fruits, such as peaches, mangoes and avocados contain just one large seed inside a hard stone. Other fruits, such as Oranges, lemons, apples, and Pears, contain several seeds called pips. Berries have lots of tiny pips around the outside of each fruit.
A good rule of thumb is, if the seed is hard, don't eat it. You would naturally eat cucumber, pea, bean and tomato seeds, but not apple or peach seeds. Melon, sunflower and squash seeds are edible even though you might find them hard in the fruit, but they are exceptions to the rule.
Some fruits, such as peaches, mangoes and avocados contain just one large seed inside a hard stone. Other fruits, such as oranges, lemons, apples, and pears, contain several seeds called pips. Berries have lots of tiny pips around the outside of each fruit.
The Ethelyn gas is produced by the fruits. If you keep your fruits in the refrigerator the Ethelyn gas will stay inside the fruit and will not be able to come out because it is hard for it yo expand so if you keep your fruits outside the refrigerator then your fruits will last longer.
ambot
That is just like asking why are we hard on the outside and all gushy and bloody on the inside
Biologically speaking, all 'fruits' have seeds, as that is the definition of a fruit. The fruits we see for sale at grocers and supermarkets however, have been specially bred for human consumption - namely more edible flesh, and a lack of seeds. They are very different from how they appear in the wild - a natural banana is packed with hard seeds for example.
Inside apples. They are the hard, dark bits.
Many seeds have hard coats or cases to protect them as they grow. Some plants also have tasty, colorful fruits glowing around their seeds. Animals eat the seeds along with the food. This helps to spread the seeds.
Grain is the small, hard, fruits or seeds of arable crops. Commonly:grassescaryopsiscereal